I'm upgrading my machine to be more rigid and accurate with the goal of cutting aluminum. One of the upgrades is to convert from belts to leadscrews. X and Y are planned to be 1/2-10 ACME, 5-start leadscrew. (Y is shorter so that could be 3/8-8 4-start, both have the same 1/2" lead length). Currently I have 62 oz-in NEMA17's which I think will "work" but probably won't be able to realize the full potential especially for cutting aluminum. What specific motors are others using with their leadscrew machines, and can you cut aluminum without too much chattering? Don't just say "Nema 23"... I want to know which ones specifically. I'm guessing I will need to also upgrade my driver to something other than grblShield (2.5A / motor, with the dual Y motors sharing a channel).